129015552672 has 36 divisors (see below), whose sum is σ = 366887978730. Its totient is φ = 43005184128.

The previous prime is 129015552671. The next prime is 129015552691. The reversal of 129015552672 is 276255510921.

129015552672 is a `hidden beast` number, since 1 + 2 + 9 + 0 + 1 + 55 + 526 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 71052101136 + 57963451536 = 266556^2 + 240756^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (129015552671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223985047 + ... + 223985622.

Almost surely, 2^129015552672 is an apocalyptic number.

129015552672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129015552672 is an abundant number, since it is smaller than the sum of its proper divisors (237872426058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129015552672 is a wasteful number, since it uses less digits than its factorization.

129015552672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447970685 (or 447970674 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 129015552672 in words is "one hundred twenty-nine billion, fifteen million, five hundred fifty-two thousand, six hundred seventy-two".